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Goodwill (Details) - EUR (€)
€ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Goodwill        
Goodwill € 43,161 € 43,391 € 43,158 € 44,155
CGU: MAT Software        
Goodwill        
Goodwill 28,961 28,961 28,961  
CGU: e-Prototypy        
Goodwill        
Goodwill 809 799 787  
CGU: ACTech        
Goodwill        
Goodwill 8,812 8,812 8,812  
CGU: OrthoView        
Goodwill        
Goodwill € 4,579 € 4,819 € 4,598